Valve tappet



Patented Novalz, 1929 A errzoaefny n.' Rien,oruisafrrrnn carinii, MICHIGAN l VVALVE 'mirante Application medfmvemberiz, 192s. seriai No. swf/43. -V

I Thisinvention relates to valve tappets for internal combustion engines, and its principal object'is to increase 'the'eliiciency of such tappets and to .overcome certain objectionable features now present therein. .It is well known that valve tappets employ an adjustment stud for engagement with the stem of the valve with which the tappet is used, and that considerably difficulty has been experienced in. forming the .threadedbore for the adjustment stud intrue alignment with theA axis of the tappet, the result'being that fre- `quentlyy the stem is tilted slightlyand the contacting end ofl thel stud instead of being vat perfect right angles to lthel axis of the stem is slightly inclined, so that its `entire .end does not contact with the end of the valveV stem.

Furthermore, it Vhas been -Observed that when the lock nut, usually employed in con. nection with the adjustment stud, is screwed up tightly against the end of the tappet stem, the wall surrounding; the threaded portion thereof becomes bulged outwardly, and although this bulged portion is very slight, yet it interferes with the perfect operation of the tappet and the valve, because valve tap-V pets are fitted fairly close in the guides in which they are held andthe bulged, portion causes `the. sternA of the tappettobear unequally in the guide and'vprevents it from moving freely therein because of the friction between th'ebulgedportion and the guide.

Y In accordance withV the present invention, I

have overcome these yvarious diliicul'ties and have provided `a tappet whereinthe adjust` ment stud is held in exact cor-'axialv alignment with vthe tappet andthe possibility of bulg-` ing is eliminated.' ,j L* y.'

'With these and otherv objectsand ladvantages in view, the A.invention consists in a valve tappet having :an adjustment stud vthreadedly secured in the head portion ofthe tappet and extending-oi1tthrough an opening in the stem end.' Itfurther yconsists in a tappet in whichithebore inthestem end of the tappet is unprovided withfany screw threads for the adjustmenty stud, :whereby the ossibility ofpb'ulging, when pressure is applied thereto by a lock nut,'is eliminated.

It further consistsvin a 'tappet having airel`1 inforcingv element for the neckthe heady of the tappet;vv

-It further consists in the severalnovel-features hereinafter fully set forth and claimed.

portion of The invention isjclearly illustrated in the r drawing accompanying this specification in Figure lis a central -longitudinalsectio-n through; a valve tappet embodying. a` simple formof the present'inventioni; 1;;

y Fig. 2l is a view-similar.to-Fig.v 1 -withthe adjustment stud andflock nut .removed therejfrom; V a f w.,

' ]1"ig;;3 isv an end view'of the' tappet lookin-g. at the head'portionthereof;v Fig. L is ahorizontal'section taken lon the Fig. v5` is a centralV longitudinal' section throughI a slightly modied kformof theng ventiQn. -y v ,l l. j j.

Referringxto said reference character 6: designates `ahollow Stem, Preferably formed of steel, and 7 designates'the cam ycontacting head of the ytappet which, in

accordance vwith one form of the invention,

may be formed ofv cast iron. lThelhead por- A tion i-s cast with' a neck 8` whichfits tightly in the' upper end of the hollow stem zand is Y secured thereto by a close fit, or itA may be spotl welded. thereto as desired.- The'gneck isformed with Va shoulder 9 'againstfwhich the extreme end of the holl-owfstem engages. The ,wall `of the' main; portion of` the" stem maybe 4made relativelyr thin in orderltoobtain' f y lightness, and thewall 10 at the end portion of theftappet opposite theghead" 7 visthicker so v than the wall of the rmain portion. and; is

flattened atY two' sides lfor the ,reception of Ala wrench orV other tool.

The, stern portion is preferably I formedof a steel rodV bored: ont to provide the thin walled main portion, andY also bored out 'at the end opposite thehead to forma' stud receiving unthreaded bore 11.' The neck of the head portion'is bored and tapped'as at 12 for the 'reception of the threaded' end 13 of an adjustment stud 14,a`nd said :adjustment studextendsout through theborelll and is provided wthfa zthreade'd portion ltradja.- cent its head 16, which threaded portion. 15

'ico' is of Vapproximately the same diameter as the diameter of the unthreaded bore 11 and iits nicelythereon. VThe remainder of the Vstern portion .beyond the threaded part l5 is preferably reduced in diameter, whereby it may be readily 'inserted through the bore 11 in assembling the':parten` l-hejusmalaloel;V

nut V17 f is threaded the threadedx part `155 'Y the portion of the stem iardund tilebore v of the adjustment stud and is arranged .to

bear against the extreme Aend ofthe .tappet YStem. ,y It is to be observed that the threadedparjtY 15 ofthe adjustlnentietud doesnot engage 1n any threaded part in thefwaFll :1?0 ofthe tappeti Stem, and,'eonsequent1y, when the lock nut iskv serewediupitght, there isnejtendencylior toilbuL-gef entwardly.v Eurthermore,inasinuch asfthe eifectveconneetin 'btwveenfthe @adself perfectlyV in the bore 11 in which itiits.

In talglipete Where the threaded conneetion between the@ stemfand adj usment studfismade ati the end of thesten,thefinelined sidesoi the fthreals'fip theadinstment' stad' Ftendto elimb lpthejiinelined sidesro the. threads vinsthe vtappet stern when the lock nutis bulge outwardly. THisiszentifrely eliminated tappet- Furthermore,` the adjustment stud fbefifnfglorrned oE steel,4f it reinfdreesthefmore Inithef'orm'rolf #the a'u'rwefnton illustrated. im Fig.r '5, :the maj or-porti0n'of the 'head' .portion Ifais formedidfsteehiatnd the cam'contactifng f ffaee'ffb' is momposedof 'o'ast'irn'for white iroin integrally unitedy vWith'theA main .pofrtioh'v of Vcontacti-ngl'emi ofitheadjustment emdehuld,

f ing @der theeadjuanea@ fsjwa stonata hardened# This may fbefone -bvrfritidn quickly quendhing thejsainej 1 More oriess variatioagf ieneexaaeaefaiiis "of A conetruction is Vgpossilole without fdepart {ing from-the spiritottthisginvention.V I, :dei-

:exact ffoirin o'f. the construction showin and 1 f described,fbutintend, linsthe folloWin-gzolaims toY pointV out fall off -the ,invention dislosed herein. i l* 1 I claim as new, and desire to secure by Letters Patent:

l. A valve tappet comprising an axiallyv bored unthreaded tappetstem,` a head on one end of said stem, an adjustment stud threadedlyrseeured in said head1 and'protruding Stud vhaiilinz-g,-,alv'a'lve Contactir'igi head don its on saidvadjustmentistud adjacentl its head "for ioni nur, and sadiast mentioned Screw .outerf.end, and there beingserew threads Y threaded portion fitting I in an UnthreadedV Y portion of the bore of the stem, and a lock nut y onizfthegthreaded ifportfion oi the adj ustnient stud adjacent its head and arranged to portion :for a 'look 4 nut 'adjaeentits `head porey tiongsaid xthreaded iporltion jbeing contained in the Unthreaded bore "ott theY stem and )said studfbe'ing provided with af'threadedendportion jtlfi'r'eadedlly secured in `thetapqgiet'headf, f and there-'vgheingia `loek nutwonathe threaded portiono rfthe Stn'd` f-adijaeent .its Vvfhead' and adapted to 'ilnpinge :against tlfe. 'Unthreaded end'offthe'stem.,I Ly f ,y

.yalve talppiet comprisingi `-a 1 Ihollow stein havingan unthreaded boreat'onerend, a

lseparate'nam contacting; Ihead having a neck portion. secured in. the iother .end `olf thefstem, said :neck Vportion having ia'threaded:bore

therein, an'iadj ustment stud "ihav-ingl 5a :Valt/fe ;V

eoniiae-tingl'head 'onfonee'nd and/formed with loe'knut receiving screwthrea-dsadj acent :said headv,lthe 'other end of Said adjustment stud beingk iol-med :with sorew 7threads :engaging in the threadedfbore of fthe neck Aoi `-the rtappet inapinge against nthe"ainthreaded` end of .the

stem.

45A valve wpprwmpngmg @hollow thin walled stern portion :formed fat'vrone fend rWith am 2agriafl-.'un'threaded boref of less. diameter than "'t'hewinternalidiaineter lof the-main p0rhead, land-ia ion thethreadedaportion Y Vofthe 'stud adfjaeen'titsv head `and adapted to tion iof ithe?` fstem, "a separate cam COntating head having l'ain 'internally threaded neck se*- cured in the other end offthe stem?, anad-l j-ustment etudihavi-ng a .valve icontacting head Y en 'one 'endfand-ormed with `a threaded -:por-

ffao i tion adjacent' `said headfttingainthefrei dueed mirthreadedfborelrf #the atappet stein, an'ditheotherend loifsaid adj ustmentstudfbeinglthireaded and engaging inthe jserew Y ythreacls;of the )threaded rbore of v.the tappety head, and'al'o'ck` nutionfthefthreaded portion of the* stud adjaoentiits fendsand adapted 'to impinge iaigfalijn'st: thefunthreaded Zend `"of the j l A fvalif'e tappeti comprising a :steel `$1430 Y 1,735,695 l l portion 'axially bore throughout the major portion of its length to provide a thin Wall and having an Unthreaded bore at one end of reduced diameter and co-aXialLWiththe first mentioned bore, a castron cam Contacting head havingra neck fitting in and secured in the larger bore of the stem, said neck being bored and internally threaded, and an adjustment stud having a valve contacting head at one end and formed with screw threads adj acent said head, a lock nut threadedly securedy upon said threads of the adjustment stud and arranged to bearagainst the adjacent end of the stem, and the inner end of said adjustment stud being of reduced diameter and having threads thereon engaging in the ,threads of the threaded bore in the neck of the tappet head.

GEORGE R. RICH. 

